The CIA, which already has Flickr and YouTube accounts, also joined Facebook on Friday.

"By expanding to these platforms, CIA will be able to more directly engage with the public and provide information on CIA's mission, history, and other developments," CIA Director John Brennan said, in a statement.

"We have important insights to share, and we want to make sure that unclassified information about the agency is more accessible to the American public that we serve, consistent with our national security mission."